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This Sonata will be the death of me. I have been working on my friends car, it will run for a week then a new problem. Quick recap, started with transmission speed sensor, then spark plugs and cable, then crankshaft position sensor, then the inner timing belt then onto a P0300 code a few weeks later, found the coil on plug setup was throwing sparks from the outside. Replaced them.
Now the car died, all electronics went dead. Car an be jumped, also the battery will gain a full charge using a charger over night, car will start, battery seems to hold 11.9v while car is running. Took it out for a drive, got back died again. Took off the alternator, had three auto stores test it, all said the alternator is working just fine. I have checked all the fuses, even the fuse between the alternator and battery. I see no corosion or issues on the battery, the grounds all seem to be in place. I took out the ECU cleaned the terminals to make sure there was no issue there. Still all the same problems. So after cleaning and tightening and double checking everything. I am out of ideas, I dont want to throw parts at this car so we are holding off on a new alternator because the stores said the part was fine. But if the battery can be fully charged overnight I would assume the battery is ok. Any ideas? What could be causing this issue in the charging system.
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If I recall correctly, this engine is an interference engine. If your timing belt broke, then you wouldn’t be able to turn your engine won’t be turning over with a “whirring” noise. Someone else may want to chime in.
[quote=”KingMeander” post=97541]If I recall correctly, this engine is an interference engine. If your timing belt broke, then you wouldn’t be able to turn your engine won’t be turning over with a “whirring” noise. Someone else may want to chime in.[/quote]
I am going to have to do some more poking around. This car really has been one thing after another. I get it on the road for about 48 hours before something else breaks. Started all with a transmission speed sensor.
[quote=”KingMeander” post=97541]If I recall correctly, this engine is an interference engine. If your timing belt broke, then you wouldn’t be able to turn your engine won’t be turning over with a “whirring” noise. Someone else may want to chime in.[/quote]
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So for some reason the timing belt slipped forward, then a thin sliver came off and wound around the crank shaft pulley and tore apart the belt. The belt did not snap but I am not sure how much damage could have been done here. We bought a new tensioner set and a new belt. How can I prevent this from happening again?
Likely no damage to the engine since the belt is still technically intact. It would be good to find the cause of that issue however. I’d be checking the tensioner. I’d also check to see if the retainers are in place. I don’t know for sure but I think there’s one that’s suppose to locate the belt on the crank.
[quote=”EricTheCarGuy” post=97933]Likely no damage to the engine since the belt is still technically intact. It would be good to find the cause of that issue however. I’d be checking the tensioner. I’d also check to see if the retainers are in place. I don’t know for sure but I think there’s one that’s suppose to locate the belt on the crank.[/quote]
SO.. Pretty bad.
We had to remove the old timing belt it was due to the tensioner pulley giving out. It took out the smaller inner timing belt as well, the brand new crankshaft position sensor we just put in at the start of this mess, along with the crank sensor plate. We changed out the water pump while we were at it, figured may as well while we are changing the belt. Trying to align the crankshaft was not working so I removed the valve cover and I saw some ugly stuff. ALL of the rocker arms had come flying off when the belt slipped. They just seem to sit on top and are held in place by the CAM. After removing the cams, placing all the arms back, I removed the spark plugs… and they were all smashed in, this I have NO clue how that can happen. I tried turning his car over to get the crankshaft realigned because I couldnt turn it by hand, it turned over full revolution and was able to be realigned without any strange noises. But I am still alarmed and want to see what I should check before we put the car back together and try and start it up.
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I think the pic of the spark plug is most telling. Looks like something got down into that cylinder. If that’s the case, you’re in for a rebuild or replacement of the engine.
Keep us posted.
[quote=”EricTheCarGuy” post=98308]I think the pic of the spark plug is most telling. Looks like something got down into that cylinder. If that’s the case, you’re in for a rebuild or replacement of the engine.
Keep us posted.[/quote]
Two out of the 4 were smashed, one was just bent and the 4th was just fine. I read somewhere that on some cars you can over torque the plug and it will sit too low? Resulting in contact. But I have a feeling that would be too good to be true in this case.. Looks as if I will be taking more off this weekend.
You might be able to get an inspection light down into the cylinder through the spark plug hole where you can inspect for impact damage. If you find any, the engine is done and needs to be rebuilt or replaced.
[quote=”EricTheCarGuy” post=98363]You might be able to get an inspection light down into the cylinder through the spark plug hole where you can inspect for impact damage. If you find any, the engine is done and needs to be rebuilt or replaced.[/quote]
So far… I think we are gonna be ok. I placed a magnet into the spark plug holes and fished around for any metal bits. It seems to be clean. Just need to install the crankshaft sprocket which my puller only does just that… pulls. So I am not sure how to install it because I don’t wish to drop $40 on a kit just to install this thing but I also know its ill advised to bang it back on with a hammer.
Batteries are like light bulbs-age does not matter-a load test of the battery is necessary. A left field idea is to also have the starter checked for an internal short-have seen my share of starters that work OK but will drain the battery overnight. Let us know how you make out! By the way, a weak or internally shorted battery can upset the electrical signals for the ignition system resulting in misfire etc. Don’t give up!
Sunset here again-apologies-I failed to see there were 2 more pages of posts when I sent my first reply. Looking at the photos of the spark plugs there is absolutely something in the cylinder(s) that caused this damage. Not getting any loose metal out of the cylinders with a magnet is not conclusive. I’d bet that the pieces (probably of the valve faces are embedded in the tops of the pistons. See if you can borrow or rent a digital bore scope and go back in and look around the cylinders again. I strongly believe something broken is inside the cylinders.
I’ve seen this timing belt carnage many times.
The valves hitting the pistons is the cause of the rockers popping off. The broken spark plugs I suspect are due to valve heads breaking off and bouncing around in the cylinder.
For a full assessment of the engine’s condition you need to pull the head.
The magnet may not do you any good. Many engine components are non ferris meaning they’re not magnetic. If the inside of the cylinder looks anything like that spark plug I think you’re wasting your time. I could be wrong though.
Keep us posted.
+1 ETCG
Go get a cheap inspection Camera and check in the cylinder. Harbor freight carries them very cheap so does ebay. IMO the engine is toast. I bet when the belt slipped it jumped out of time and the clunk that was heard is valve striking the piston head. Then you have to decide if you want to put 2800$+ into the car for the reman engine.Well, you never know. I’ve seen where a few valve were bent to where the insides of the cylinders looked like aluminum cottage cheese. The spark plug damage tells us this isn’t going to be the first case. Still if the cylinder walls aren’t marred and the pistons not cracked (they are not going to look pretty) a new or fixed head could put it back on the road.
To know all of this you need to do cleaning and then put eyeballs on the subject which is why I suggest pulling the head. In a case like this head pulling is an automatic if to do nothing more than rolling the valves to see which are bent.
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